Nic-A-Tone Toner Kit to Darken Clean Copper Coins Nic-A-Tone Cent Toner Kit provides all of the necessary tools to restore the tone to copper coins Place the coin in the holder to secure the coin in place, then add one drop of Cent Toner to the coin and brush until the coin reaches the desired shade Many applications will darken coins This product is not recommended for uncirculated or proof coins This listening is for a single 1.25 fl. oz. bottle, brush, and holder